Sludge In Anthropology

I am concentrating on the medical part of anthropology and eventually going on to medical school. The health of the community is foremost in my mind.
The problem in this area is the sewer sludge put on agricultural lands to fertilize the crops. The farmers buy the sludge and truck it to the fields. The problem is the sludge is not tested to determine if there are pathogens living in the supposedly treated sludge. A rancher was having problems with E. coli in his newborn calves. He asked me what the problem was and I went out and cultured a sample of the area around the barn and found E. coli bacteria in numerous amounts in the sludge put on the field behind the barn. Harvesting crops from land which has been fertilized with this sludge can